Organic Halogen and Related Trace Gases in the Tropical Atmosphere: Results from Recent Airborne Campaigns over the Pacific Elliot Atlas 1, Maria Navarro.

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Organic Halogen and Related Trace Gases in the Tropical Atmosphere: Results from Recent Airborne Campaigns over the Pacific Elliot Atlas 1, Maria Navarro 1, Valeria Donets 1, Sue Schauffler 2, Rich Lueb 1, Roger Hendershot 2, Steve Gabbard 2, Rebecca Hornbrook 2, Eric Apel 2, Dan Riemer 1, Laura Pan 2, Ross Salawitch 3, Julie Nicely 3, Steve Montzka 4, Ben Miller 4,5, Fred Moore 4,5, James W. Elkins 4, Eric Hintsa 4,5,Teresa Campos 2, Birgit Quack 6, Xiaorong Zhu 1, Leslie Pope 1 + SHIVA, ATTREX and CONTRAST teams 1 RSMAS, University of Miami, Miami, FL 2 Atmospheric Chemistry Division, NCAR, Boulder, CO 3 University of Maryland, College Park, MD 4 ESRL, NOAA, Boulder, CO 5 CIRES, NOAA, Boulder, CO 6 GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany

Motivation How does tropical convection in the West Pacific influence the composition of air entering the stratosphere? – CONTRAST: define vertical distributions, variations, sources; transport to/into the base of the TTL – ATTREX: evaluate variation and transport through TTL and into lower stratosphere.

AWAS Sample Locations

Focus on AWAS tracers Organic Halogen Distribution/Budget – Distribution/Composition – Comparisons to recent studies HIPPO (H1: January, 2009), SHIVA (S. China Sea, Nov, 2011 – Sala et al., ACP, 2014), TC4 (August,2007) Tracer/Tracer correlations – relationships from lower troposphere to UT/LS Example TTL tracer profiles – relation to clouds/convective outflow

Tracer Selection Organic Halogen (VSLS) →Br: CHBr 3, CH 2 Br 2, CHBrCl 2, CHBr 2 Cl, CH 2 BrCl, + ? →I: CH 3 I →Cl: CHCl 3, C 2 Cl 4 Organic Nitrates →Methyl nitrate (CH 3 ONO 2 ) Hydrocarbons →C2: Ethane (C 2 H 6 ), Ethyne (C 2 H 2 )

Halon 1301 Halon 1211 Halon 2402 Halon 1202 CH 3 Br CH 2 Br 2 CH 3 Br 3 CHBrCl 2 CHBr 2 Cl CH 2 BrCl C 2 H 4 Br 2 ? Halothane Halon 1301 Halon 1211 Halon 2402 Halon 1202 CH 3 Br CH 2 Br 2 CH 3 Br 3 CHBrCl 2 CHBr 2 Cl CH 2 BrCl C 2 H 4 Br 2 ? ? ? ? ? Indian Ocean MBL, near Madagascar July, 2014 RSMAS Ambient Working Standard August, 2013 Bromoacetone (tentative i.d.) Bromine signal (79,81) NICI GC/MS

Indian Ocean MBL July, 2014 ATTREX RF N 15.8 km Halon 1301 Halon 1211 Halon 2402 Halon 1202 CH 3 Br CH 2 Br 2 CH 3 Br 3 CHBrCl 2 CHBr 2 Cl CH 2 BrCl C 2 H 4 Br 2 ? ? ? ? Halon 1301 Halon 1211 Halon 2402 Halon 1202 CH 3 Br CH 2 Br 2 CH 3 Br 3 CHBrCl 2 CHBr 2 Cl CH 2 BrCl C 2 H 4 Br 2 ? ? ? ? Halothane Bromine signal (79,81) NICI GC/MS

(from Laube et al., ACP, 2008) Cryogenic air sample, 15.2 km, Teresina, Brazil (5.4° S), 8 June 2005 C 2 H 5 Br, Halothane C 3 H 7 Br C 2 H 4 Br 2

TTL transport MeBr=38% Halons=41% S.Lived=20% MeBr=47% Halons=46% S.Lived=7.5% Convective transport MeBr=31% Halons=34% S.Lived=35% DC8 (UCI) WB-57 (UMiami) Organic Bromine over the Eastern Pacific (TC4) 65% CH 2 Br 2 20% CHBr 3

Organic Bromine – CONTRAST/ATTREX

Organic Bromine + SHIVA

Organic Bromine + SHIVA +TC4

HIPPO-1 (Jan)

CHBr 3 :CH 2 Br 2 Correlation

CHBr 3 :CH 2 Br 2 Correlation + HIPPO

CHBr 3 :CH 2 Br 2 Correlation + SHIVA

Ethane: Ethyne Correlation

GWAS SAMPLES RF_02 (Circle Flight)

Ethyne C 2 H 2 (RF02)

Tetrachloroethene C 2 Cl 4 (RF02)

Methyl Iodide CH 3 I (RF02)

Methyl Nitrate CH 3 ONO 2 (RF02)

Ethyne C 2 H 2 (RF02)

Vertical Distribution + v Clouds Tropical

HIPPO1 Methyl Nitrate

Methyl Nitrate: C 2 Cl 4 Correlation (RF02)

Methyl Nitrate: C 2 Cl 4 Correlation ATTREX (all)

Methyl Nitrate: C 2 Cl 4 Correlation ATTREX + CONTRAST

ATTREX RF03 (Faxai) Methyl Iodide Methyl Nitrate

ATTREX RF03 (Faxai) Methyl Iodide Methyl Nitrate

SUMMARY Organic bromine budget well constrained in TTL; consistent with larger scale distributions Tracer-tracer correlations identify links between CONTRAST/ATTREX measurement Gradients in TTL often complex in this region; impact of clouds/variable sources/layers.